More Mosquito Days Increase the Risk of Mosquito Borne Disease in the U.S

Climate Central published a report this week that found the number of days each year with ideal conditions for mosquitos is increasing.

Vice President of Research at Climate Control Dr. Alyson Kenward explained that “mosquito days” are those where the temperature is between 50 and 95 degrees and the humidity is above 42 percent.

“When it’s hotter than that, or when it’s colder than that, or when it’s drier than that, the mosquito isn’t going to be prevalent,” she said.

The research team looked into climate histories for the 200 biggest cities in America, dating back to 1980 for this report. They wanted to see how many days on average fit the mosquito day criteria in each city.

“What we found was that in most cities, the number of days each year with these conditions on average, has been rising since the 1980s,” she said.

Kenward said the increase in mosquito days can be attributed to climate change.

“In a warming world, you find more moisture in the air,” she said. “It’s a combination of warmer temperatures and increased humidity.”

The concern with an increase in mosquito days is an increase in transmission time for mosquito-born illness like Zika or West Nile.

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